All three of mine are from the local shelter/pound.
Simba "lived" in the shelter for 4 months, he was overlooked many times and probably would have been killed very soon. They already had another dog in his kennel with him while the other dogs got their own.

Kiara barked at everyone except for my dad and I.

I think Nala would be the only one who would have gotten snatched up the next day if we didn't take her. She was with her littermates and they were all playful... playful puppies go like hotcakes in shelters!